From: Mikulas Patocka Date: Thu, 23 Jan 2014 19:43:10 +0000 (-0500) Subject: tgafb: fix data copying X-Git-Tag: firefly_0821_release~3679^2~2350 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=0c6859c7f5b26fc236d301563dd5b3d5945cf557;p=firefly-linux-kernel-4.4.55.git tgafb: fix data copying commit 6b0df6827bb6fcacb158dff29ad0a62d6418b534 upstream. The functions for data copying copyarea_foreward_8bpp and copyarea_backward_8bpp are buggy, they produce screen corruption. This patch fixes the functions and moves the logic to one function "copyarea_8bpp". For simplicity, the function only handles copying that is aligned on 8 pixes. If we copy an unaligned area, generic function cfb_copyarea is used. Signed-off-by: Mikulas Patocka Signed-off-by: Tomi Valkeinen Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/video/tgafb.c b/drivers/video/tgafb.c index c9c8e5a1fdee..ba77f753649c 100644 --- a/drivers/video/tgafb.c +++ b/drivers/video/tgafb.c @@ -1142,222 +1142,57 @@ copyarea_line_32bpp(struct fb_info *info, u32 dy, u32 sy, __raw_writel(TGA_MODE_SBM_24BPP|TGA_MODE_SIMPLE, tga_regs+TGA_MODE_REG); } -/* The general case of forward copy in 8bpp mode. */ +/* The (almost) general case of backward copy in 8bpp mode. */ static inline void -copyarea_foreward_8bpp(struct fb_info *info, u32 dx, u32 dy, u32 sx, u32 sy, - u32 height, u32 width, u32 line_length) +copyarea_8bpp(struct fb_info *info, u32 dx, u32 dy, u32 sx, u32 sy, + u32 height, u32 width, u32 line_length, + const struct fb_copyarea *area) { struct tga_par *par = (struct tga_par *) info->par; - unsigned long i, copied, left; - unsigned long dpos, spos, dalign, salign, yincr; - u32 smask_first, dmask_first, dmask_last; - int pixel_shift, need_prime, need_second; - unsigned long n64, n32, xincr_first; + unsigned i, yincr; + int depos, sepos, backward, last_step, step; + u32 mask_last; + unsigned n32; void __iomem *tga_regs; void __iomem *tga_fb; - yincr = line_length; - if (dy > sy) { - dy += height - 1; - sy += height - 1; - yincr = -yincr; - } - - /* Compute the offsets and alignments in the frame buffer. - More than anything else, these control how we do copies. */ - dpos = dy * line_length + dx; - spos = sy * line_length + sx; - dalign = dpos & 7; - salign = spos & 7; - dpos &= -8; - spos &= -8; - - /* Compute the value for the PIXELSHIFT register. This controls - both non-co-aligned source and destination and copy direction. */ - if (dalign >= salign) - pixel_shift = dalign - salign; - else - pixel_shift = 8 - (salign - dalign); - - /* Figure out if we need an additional priming step for the - residue register. */ - need_prime = (salign > dalign); - if (need_prime) - dpos -= 8; - - /* Begin by copying the leading unaligned destination. Copy enough - to make the next destination address 32-byte aligned. */ - copied = 32 - (dalign + (dpos & 31)); - if (copied == 32) - copied = 0; - xincr_first = (copied + 7) & -8; - smask_first = dmask_first = (1ul << copied) - 1; - smask_first <<= salign; - dmask_first <<= dalign + need_prime*8; - if (need_prime && copied > 24) - copied -= 8; - left = width - copied; - - /* Care for small copies. */ - if (copied > width) { - u32 t; - t = (1ul << width) - 1; - t <<= dalign + need_prime*8; - dmask_first &= t; - left = 0; - } - - /* Attempt to use 64-byte copies. This is only possible if the - source and destination are co-aligned at 64 bytes. */ - n64 = need_second = 0; - if ((dpos & 63) == (spos & 63) - && (height == 1 || line_length % 64 == 0)) { - /* We may need a 32-byte copy to ensure 64 byte alignment. */ - need_second = (dpos + xincr_first) & 63; - if ((need_second & 32) != need_second) - printk(KERN_ERR "tgafb: need_second wrong\n"); - if (left >= need_second + 64) { - left -= need_second; - n64 = left / 64; - left %= 64; - } else - need_second = 0; - } - - /* Copy trailing full 32-byte sections. This will be the main - loop if the 64 byte loop can't be used. */ - n32 = left / 32; - left %= 32; - - /* Copy the trailing unaligned destination. */ - dmask_last = (1ul << left) - 1; - - tga_regs = par->tga_regs_base; - tga_fb = par->tga_fb_base; - - /* Set up the MODE and PIXELSHIFT registers. */ - __raw_writel(TGA_MODE_SBM_8BPP|TGA_MODE_COPY, tga_regs+TGA_MODE_REG); - __raw_writel(pixel_shift, tga_regs+TGA_PIXELSHIFT_REG); - wmb(); - - for (i = 0; i < height; ++i) { - unsigned long j; - void __iomem *sfb; - void __iomem *dfb; - - sfb = tga_fb + spos; - dfb = tga_fb + dpos; - if (dmask_first) { - __raw_writel(smask_first, sfb); - wmb(); - __raw_writel(dmask_first, dfb); - wmb(); - sfb += xincr_first; - dfb += xincr_first; - } - - if (need_second) { - __raw_writel(0xffffffff, sfb); - wmb(); - __raw_writel(0xffffffff, dfb); - wmb(); - sfb += 32; - dfb += 32; - } - - if (n64 && (((unsigned long)sfb | (unsigned long)dfb) & 63)) - printk(KERN_ERR - "tgafb: misaligned copy64 (s:%p, d:%p)\n", - sfb, dfb); - - for (j = 0; j < n64; ++j) { - __raw_writel(sfb - tga_fb, tga_regs+TGA_COPY64_SRC); - wmb(); - __raw_writel(dfb - tga_fb, tga_regs+TGA_COPY64_DST); - wmb(); - sfb += 64; - dfb += 64; - } - - for (j = 0; j < n32; ++j) { - __raw_writel(0xffffffff, sfb); - wmb(); - __raw_writel(0xffffffff, dfb); - wmb(); - sfb += 32; - dfb += 32; - } - - if (dmask_last) { - __raw_writel(0xffffffff, sfb); - wmb(); - __raw_writel(dmask_last, dfb); - wmb(); - } - - spos += yincr; - dpos += yincr; + /* Do acceleration only if we are aligned on 8 pixels */ + if ((dx | sx | width) & 7) { + cfb_copyarea(info, area); + return; } - /* Reset the MODE register to normal. */ - __raw_writel(TGA_MODE_SBM_8BPP|TGA_MODE_SIMPLE, tga_regs+TGA_MODE_REG); -} - -/* The (almost) general case of backward copy in 8bpp mode. */ -static inline void -copyarea_backward_8bpp(struct fb_info *info, u32 dx, u32 dy, u32 sx, u32 sy, - u32 height, u32 width, u32 line_length, - const struct fb_copyarea *area) -{ - struct tga_par *par = (struct tga_par *) info->par; - unsigned long i, left, yincr; - unsigned long depos, sepos, dealign, sealign; - u32 mask_first, mask_last; - unsigned long n32; - void __iomem *tga_regs; - void __iomem *tga_fb; - yincr = line_length; if (dy > sy) { dy += height - 1; sy += height - 1; yincr = -yincr; } + backward = dy == sy && dx > sx && dx < sx + width; /* Compute the offsets and alignments in the frame buffer. More than anything else, these control how we do copies. */ - depos = dy * line_length + dx + width; - sepos = sy * line_length + sx + width; - dealign = depos & 7; - sealign = sepos & 7; - - /* ??? The documentation appears to be incorrect (or very - misleading) wrt how pixel shifting works in backward copy - mode, i.e. when PIXELSHIFT is negative. I give up for now. - Do handle the common case of co-aligned backward copies, - but frob everything else back on generic code. */ - if (dealign != sealign) { - cfb_copyarea(info, area); - return; - } - - /* We begin the copy with the trailing pixels of the - unaligned destination. */ - mask_first = (1ul << dealign) - 1; - left = width - dealign; - - /* Care for small copies. */ - if (dealign > width) { - mask_first ^= (1ul << (dealign - width)) - 1; - left = 0; - } + depos = dy * line_length + dx; + sepos = sy * line_length + sx; + if (backward) + depos += width, sepos += width; /* Next copy full words at a time. */ - n32 = left / 32; - left %= 32; + n32 = width / 32; + last_step = width % 32; /* Finally copy the unaligned head of the span. */ - mask_last = -1 << (32 - left); + mask_last = (1ul << last_step) - 1; + + if (!backward) { + step = 32; + last_step = 32; + } else { + step = -32; + last_step = -last_step; + sepos -= 32; + depos -= 32; + } tga_regs = par->tga_regs_base; tga_fb = par->tga_fb_base; @@ -1374,25 +1209,33 @@ copyarea_backward_8bpp(struct fb_info *info, u32 dx, u32 dy, u32 sx, u32 sy, sfb = tga_fb + sepos; dfb = tga_fb + depos; - if (mask_first) { - __raw_writel(mask_first, sfb); - wmb(); - __raw_writel(mask_first, dfb); - wmb(); - } - for (j = 0; j < n32; ++j) { - sfb -= 32; - dfb -= 32; + for (j = 0; j < n32; j++) { + if (j < 2 && j + 1 < n32 && !backward && + !(((unsigned long)sfb | (unsigned long)dfb) & 63)) { + do { + __raw_writel(sfb - tga_fb, tga_regs+TGA_COPY64_SRC); + wmb(); + __raw_writel(dfb - tga_fb, tga_regs+TGA_COPY64_DST); + wmb(); + sfb += 64; + dfb += 64; + j += 2; + } while (j + 1 < n32); + j--; + continue; + } __raw_writel(0xffffffff, sfb); wmb(); __raw_writel(0xffffffff, dfb); wmb(); + sfb += step; + dfb += step; } if (mask_last) { - sfb -= 32; - dfb -= 32; + sfb += last_step - step; + dfb += last_step - step; __raw_writel(mask_last, sfb); wmb(); __raw_writel(mask_last, dfb); @@ -1453,14 +1296,9 @@ tgafb_copyarea(struct fb_info *info, const struct fb_copyarea *area) else if (bpp == 32) cfb_copyarea(info, area); - /* Detect overlapping source and destination that requires - a backward copy. */ - else if (dy == sy && dx > sx && dx < sx + width) - copyarea_backward_8bpp(info, dx, dy, sx, sy, height, - width, line_length, area); else - copyarea_foreward_8bpp(info, dx, dy, sx, sy, height, - width, line_length); + copyarea_8bpp(info, dx, dy, sx, sy, height, + width, line_length, area); }